writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA); /* Dummy read */ readb(i2c->base + MPC_I2C_DR); } for (i = 0; i < length; i++) { if (i2c_wait(i2c, timeout, 0) < 0) return -1; /* Generate txack on next to last byte */ //注意这里TXAK置1,表示CPU每收到1byte...
但因为与其自身的地址不相符合,因此提前退 出与主控器的通信;2.主控器读取数据的过程:读的过程比较复杂,在从slave读出数据前,你必须先要告诉它哪个内部寄存器是你想 要读取的,因此必须先对其进行写入 (dummy write):发送起始位;* 发送 slave 地址 +write bit set ;发送内部寄存器地址;重新发送起始位,即restart ...
A dummy read of I2C_I2DR in Slave Receive mode releases SCL, allowing themaster to send data. 我也在stackoverflow上面找了了关于dummy read解释,仅供参考。 This read is not a true read of the I2C bus, but is a read of the IICD register in the IIC block. It will not be seen on th...
(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA); /* Dummy read */ readb(i2c->base + MPC_I2C_DR); } for (i = 0; i < length; i++) { if (i2c_wait(i2c, timeout, 0) < 0) return -1; /* Generate txack on next to last byte */ //注意这里TXAK置1,表示CPU每收到1byte数据后,...
I2C1_D = (ACCEL_I2C_ADDRESS << 1) | 0x01; //read address i2c_Wait(); /* Put in Rx Mode */ I2C1_C1 &= (~I2C_C1_TX_MASK); /* Ensure TXAK bit is 0 */ I2C1_C1 &= ~I2C_C1_TXAK_MASK; /* Dummy read */ result[0] = I2C1_D; ...
回到i2c_init函数,然后注册了一个空的名为dummy的i2c_driver。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 staticintdummy_probe(struct i2c_client*client,conststruct i2c_device_id*id){return0;}staticintdummy_remove(struct i2c_client*client){return0;}staticstruct i2c_driver dummy_driver={.dri...
/* Dummy read */ readb(i2c->base + MPC_I2C_DR); } for (i = 0; i < length; i++) { if (i2c_wait(i2c, timeout, 0) < 0) return -1; /* Generate txack on next to last byte */ //注意这里TXAK置1,表示CPU每收到1byte数据后,会发送ACK ...
156void i2c_master_read(I2C_Type*base,unsignedchar*buf, unsignedint size) 157{ 158volatileuint8_t dummy=0; 159 160 dummy++;/* 防止编译报错 */ 161while(!(base->I2SR&(1<<7)));/* 等待传输完成 */ 162 base->I2SR&=~(1<<1);/* 清除中断挂起位 */ ...
/* Dummy read */10. readb(i2c->base + MPC_I2C_DR);11. 12.13. 55、0; for (i = 0; i < length; i+) 14. if (i2c_wait(i2c, timeout, 0) < 0)15. return -1;16.156、7. /* Generate txack on next to last byte */18. /注意这里TXAK置1,表示CPU每收到1byte数据后,会...
读的过程比较复杂,在从slave读出数据前,你必须先要告诉它哪个内部寄存器是你想要读取的,因此必须先对其进行写入(dummy write): AI检测代码解析 发送起始位; 1. AI检测代码解析 发送slave地址+write bit set; 1. AI检测代码解析 发送内部寄存器地址; 1. ...